Etymology
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source (n.)

mid-14c., "support, base," from Old French sourse "a rising, beginning, fountainhead of a river or stream" (12c.), fem. noun taken from past participle of sourdre "to rise, spring up," from Latin surgere "to rise, arise, get up, mount up, ascend; attack," contraction of surrigere, from assimilated form of sub "up from below" (see sub-) + regere "to keep straight, guide" (from PIE root *reg- "move in a straight line," with derivatives meaning "to direct in a straight line," thus "to lead, rule"). Meaning "a first cause" is from late 14c., as is that of "fountain-head of a river." Meaning "person or written work supplying information or evidence" is by 1777.

source (v.)

"obtain from a specified source," 1972, from source (n.). Related: Sourced; sourcing.

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Definitions of source
1
source (n.)
the place where something begins, where it springs into being;
Pittsburgh is the source of the Ohio River
Synonyms: beginning / origin / root / rootage
source (n.)
a document (or organization) from which information is obtained;
the reporter had two sources for the story
source (n.)
anything that provides inspiration for later work;
Synonyms: seed / germ
source (n.)
a facility where something is available;
source (n.)
a person who supplies information;
Synonyms: informant
source (n.)
someone who originates or causes or initiates something;
Synonyms: generator / author
source (n.)
(technology) a process by which energy or a substance enters a system;
a source of carbon dioxide
a heat source
source (n.)
anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies;
Synonyms: reservoir
source (n.)
a publication (or a passage from a publication) that is referred to;
he spent hours looking for the source of that quotation
Synonyms: reference
2
source (v.)
get (a product) from another country or business;
She sourced a supply of carpet
source (v.)
specify the origin of;
The writer carefully sourced her report
From wordnet.princeton.edu